<template>
<div>message的值:{{message}}</div>
<div>obj.message的值:{{obj.message}}</div>
</template>
<script setup>
import {reactive, toRef} from 'vue'
const obj=reactive({message:'黑发不知勤学早'});
const message=toRef(obj,'message')
setTimeout(()=>{
    message.value='少壮不努力,老大徒伤悲'
},2000)
</script>